barnettimpala
New member
due to the fact that a grand prix is a giant car with giant fenders, and the 'stock' profile height with 18s is a 245/45.....you have tons and tons of room to increase wheel diameter. 20s are perfect considering 18s still have ginormo balloon tires on them.
Just personal preference I guess. Impala's have the same tire size but I like 18's on prix's and 19's on impalas. Wheels look bigger on prix's to me. Those 19's look like 20's almost on an impala. I have 235/45/18 on my impala and I love it. Of course being lowered helps